Test Plan: ran upgrade_schema.php on my local install. re-examined SQL query
"explain select * from phabricator_pastebin.pastebin_paste where authorPHID =
"PHID-USER-xee4ju2teq7mflitwfcs" ORDER BY id DESC;" on my local install and
noted fewer rows scanned, index used, etc
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, epriestley
Differential Revision: 1218
